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• W1581569435 abstract "Mammary epithelial regeneration implies the existence of cellular progenitors with retained replicative capacity, prolonged lifespan and developmental potency. Evidence exists that ΔN-p63 isoforms preserve these features by modulating p53 activity in basal epithelia. ΔN-p63 mRNA levels decline at the onset of differentiation suggesting that its transcriptional regulation may contribute to the initiation of differentiation. To study transcriptional regulation of ΔN-p63, a 10.3 kbp fragment containing the ΔN-p63 promoter was isolated. We report here that ΔN-p63 is a positive and negative transcriptional target of p53 and ΔN-p63-α, respectively. Disruption of p53 activity or expression abolishes the expression of ΔN-p63-α. This regulation is mediated by a p53-binding element sufficient to confer these activities to a heterologous promoter. Chromatin immune-precipitation indicates that, in asynchronously growing cells, p53 occupies this element. In response to DNA damage, ΔN-p63-α is recruited to this element as transcription of ΔN-p63 declines. Disruption of ΔN-p63-α expression had differential effects on the transcriptional regulation of several p53-target genes. These findings indicate that p53 contributes to the preservation of basal epithelia by driving the expression of ΔN-p63 isoforms. These studies also suggest that in response to genotoxic stress, ΔN-p63-α mediates the silencing of its own promoter thereby altering the pattern of p53-target gene expression." @default.
• W1581569435 created "2016-06-24" @default.
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• W1581569435 date "2003-10-23" @default.
• W1581569435 modified "2023-10-17" @default.
• W1581569435 title "Positive and negative regulation of ΔN-p63 promoter activity by p53 and ΔN-p63-α contributes to differential regulation of p53 target genes" @default.
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• W1581569435 doi "https://doi.org/10.1038/sj.onc.1207129" @default.
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